如果未指定该属性，优化器将生成一个基于成本的决策，为给定的表选择一种访问计划。

When this attribute is not specified, the optimizer makes a cost-based decision to select an access plan for the given table.

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由于这个类型没有为选择和分类做优化，所以我们们把日期属性作为Mingle R 1.1版的核心部分。

As this type was not optimized for the selection and sorting of dates, we have made date properties a core part of Mingle with R1.1.

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